code: def make_magic_mark_name(i):
      return MAGIC_MARK_NAME.format(i)
  
file_path: vegafusion/python/vegafusion/vegafusion/evaluation.py
imports: from altair import data_transformers, Chart, FacetChart, LayerChart, HConcatChart, VConcatChart, ConcatChart
  from altair.utils.schemapi import Undefined
label_desc: Use image node_id 1 for calling a global function with example usage: make_magic_mark_name(i) and returns: MAGIC_MARK_NAME